MP1518(2006) 데이터 시트보기 (PDF) - Monolithic Power Systems

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MP1518
(Rev.:2006)

Fixed Frequency White LED Driver

Monolithic Power Systems 

TM

MP1518 – FIXED FREQUENCY WHITE LED DRIVER

ELECTRICAL CHARACTERISTICS (continued)

VIN = VEN = 5V, TA = +25°C, unless otherwise noted.

Parameters

Symbol Condition

Enable

EN Threshold

EN Threshold

EN Hysteresis

VEN Rising

VEN Rising, VIN = 2.5V

EN Input Bias Current

Feedback

VEN = 0V, 5V

FB Voltage

FB Input Bias Current

Output Switch

SW On-Resistance (4)

SW Current Limit (4)

Thermal Shutdown (4)

VFB = 0.1V

RON

Duty Cycle = 60%

Notes:

4) Guaranteed by design.

Min Typ Max Units

1.0 1.35 1.6 V

0.8

V

90

mV

1 µA

94 104 114 mV

-600 -300

nA

0.5

Ω

350

mA

160

°C

PIN FUNCTIONS

TSOT23-6

Pin #

1

2

3

4

5

6

QFN8

Pin #

8

1, 5

6

4

3

2

Name Pin Function

SW

GND

FB

EN

OV

IN

Power Switch Output. SW is the drain of the internal MOSFET switch. Connect

the power inductor and output rectifier to SW. SW can swing between GND and

25V.

Ground.

Feedback Input. The MP1518 regulates the voltage across the current sense

resistor between FB and GND. Connect a current sense resistor from the bottom

of the LED string to GND. Connect the bottom of the LED string to FB. The

regulation voltage is 104mV.

Regulator On/Off Control Input. A high input at EN turns on the converter, and a

low input turns it off. When not used, connect EN to the input source for

automatic startup. The EN pin cannot be left floating.

Over Voltage Input. OV measures the output voltage for open circuit protection.

Connect OV to the output at the top of the LED string.

Input Supply Pin. Must be locally bypassed.

MP1518 Rev. 1.6

www.MonolithicPower.com

3

7/25/2006

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2006 MPS. All Rights Reserved.

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